+----------------------------------------------------------+
| WFPC2
| STScI Analysis Newsletter
| WFPC2 STAN 53
| November 2002
+----------------------------------------------------------+
CONTENTS:
- WFPC2 Close-Out Calibration Programs
- Pointing Uncertainties
- Instrument Science Reports Since The Previous STAN:
02-04 An Analysis of WFPC2 Filter Positional Anomalies
02-05 WFPC2 Cycle 11 Calibration Plan
02-06 SMOV3b
02-07 Updated Contamination Rates for WFPC2 UV Filters
- Jay Anderson and Ivan King Astrometry Paper on the Website
- Re-organization of the WFPC2 Documents on the Website
+----------------------------------------------------------+
WFPC2 Close-Out Calibration Programs
-Anton Koekemoer
Cycle 12 is currently planned to be the last full cycle for
WFPC2, which will be de-orbited during the next Servicing
Mission (SM4) when it is scheduled to be replaced with WFC3.
Therefore, we are currently soliciting input from the
community as to whether there are any additional calibration
programs that should be carried out with WFPC2 before it is
de-orbited, in order to improve or augment calibration
accuracies or explore new types of calibration. In conjunction
with the recent HST Calibration Workshop, a special splinter
session was devoted to the topic of WFPC2 close-out, and a
number of possible programs were identified. Some examples of
these included further refinements to the geometric solution,
improvements to the filter photometric characterizations,
better measurements of the PSF wings on large scales, and
improving the CTE characterization.
We therefore encourage any interested members of the community
to contact us with suggestions for Cycle 12 calibration
observations, which we will be defining in the next few months.
These may fall under the above categories or alternatively
address other issues that may be required in order to improve
the scientific value of archival WFPC2 data. We also remind
observers of the opportunity to submit Calibration Outsourcing
proposals of your own in Cycle 12. These may be observational,
archival, or both. Additional topics for Calibration
Outsourcing programs are listed at this website:
http://www.stsci.edu/instruments/wfpc2/wfpc2_out.html
Consultation with the WFPC2 group at STScI is also welcomed on
any of these topics (just send an email to "help@stsci.edu"
addressing the topic of WFPC2 Close-Out Calibration Programs).
We will be happy to provide advice and collaborative input,
and we strongly encourage members of the community to take the
initiative in proposing any close-out programs that you feel
would enhance the quality of some particular aspect of WFPC2
science.
Pointing Uncertainties
-Gabriel Brammer
An offset of 1-2 arcsec is found between the predicted and
actual pointing positions of a set of observations of the
standard star GRW+70D5824 taken between Jan 1999 and Aug
2002. The direction of the offset in chip coordinates
changes throughout the course of the year as the telescope
orientation changes, causing the overall uncertainty in the
absolute pointing of WFPC2 to be somewhat higher than the ~1
arcsec uncertainty in guide star positions. The r.m.s. of
the pointings is approximately 1.5 arcsec, but two individual
pointings of the same target observed about 6 months apart
could differ by as much as 5 arcsec in the worst cases. This
scatter is primarily due to misalignments of the three Fine
Guidance Sensors, and is expected to be improved by an update
to the observatory aperture file implemented on 20 Oct, 2002.
Users requiring high absolute astrometric precision for a
given image should measure positions relative to an
astrometric standard found on the same frame, if possible.
For more information, see the paper by Brammer, Whitmore,
and Koekemoer in the proceedings of the 2002 HST Calibration
Workshop (to be published in 2003).
An Analysis of WFPC2 Filter Positional Anomalies
-Shireen Gonzaga, Sylvia Baggett, John Biretta
In March of 2001, a routine analysis of FR533N VISFLAT images
revealed an anomaly: the filter wheel appeared to be offset
by about 0.42 degrees in some images. This offset angle is
close to 0.5 degrees, which corresponds to one "filter step,"
(i.e., one increment in movement of the filter wheel by the
filter electronics). These offsets are not a recent phenomena,
and have been found in data as far back as mid-1994. This
document describes a more exhaustive analysis of the filter
wheel rotation anomaly: flatfield images for all available
filters in the archive were inspected to determine if they
exhibited similar behavior. Only filters that projected
unique features (such as pinholes) onto the image were
useful because these features were needed to detect the
offsets. In addition to the previously-reported problem
with FR533N, filter wheel rotation offsets have also now
been found in these additional filter configurations: F375N,
FR418N, FR533N18, FR533N33, FR533P15, FR680N, FR680N33,
FQCH4N, FQCH4N15, and FQCH4P15. The offset angle was found
to be 0.42 +/- 0.06. The occurrence rate of the offset error
ranges from 0% to 40% for these filters (based on samples of
20 images or larger). It is also apparent that some filters
(e.g. F160BW) show no rotation errors. In general, the
errors will have little impact on GO science, though
photometric errors can reach a few percent in worst-case
scenarios. There is also some hint that the problem may be
getting worse with time. Currently, the cause of the anomaly
is not completely understood. Cycle 10 and cycle 11 calibration
programs will continue monitoring these filter wheel offsets.
WFPC2 Cycle 11 Calibration Plan
-S. Gonzaga, and the WFPC2 Group
The Cycle 11 Calibration Program, extending from July 1, 2002
to June 30, 2003 will continue to monitor the health of WFPC2,
using the standard suite of calibrations, as well as some
special programs to characterize other aspects of the
instrument. The most significant change in the routine
monitors concerns the length of time between decontaminations.
This period has been increased from 28 days to 49 days because
data from the last few cycles indicate that the contamination
rate has been decreasing. Special programs include more efforts
to characterize CTE, a revisit of the long-vs.-short anomaly,
photometry of non-standard filters for creating new zeropoints,
as well as a program to cross-calibrate WFPC2 and ACS filters.
Because there are significantly fewer primary WFPC2 science
observations in cycle 11, with the advent of ACS, the
calibration plan has been significantly scaled back, but
without sacrificing the quality of data required to calibrate
the instrument. For cycle 11, 40 external orbits will be used,
compared to 61 in cycle 10.
WFPC2 SMOV3b
-Anton Koekemoer
Servicing Mission 3B (SM3B) took place in March 2002, and the
Wide Field and Planetary Camera 2 (WFPC2) resumed operations
on March 23, 2002, after having been placed in an inactive
mode during the Servicing Mission. We describe here the results
from an extensive series of tests and observations that we
carried out with WFPC2 as part of the subsequent Observatory
Verification phase. These tests included UV monitoring of
possible contamination, performance checks of the biases,
darks and other internal calibrations, as well as PSF
measurements and flatfield verification. The results from these
tests show that there are no significant changes in the
operational behavior of the camera with respect to its pre-SM3B
performance.
Updated Contamination Rates for WFPC2 UV Filters
-Matt McMaster and Brad Whitmore
Photometric monitoring observations of a white dwarf standard
(GRW+70D5824) have been used to update the contamination rates
for WFPC2 UV filters. Observations from April 1994 through May
2002 were used in the analysis. In general, the contamination
rates have declined by roughly 50% for most of the filters
during this period. Least-squares fits have been made to the
data to allow observers to remove the effects of contamination
in their WFPC2 observations.
An Improved Distortion Solution for HST's WFPC2
-Jay Anderson and Ivan King
A preprint of a new paper by Jay Anderson and Ivan King on
an improved distortion solution for WFPC2 is available on
the WFPC2 website. The paper should appear in the Jan 2003
version of the PASP. A separate link points to a Fortran
routine that implements the distortion solution.
Re-organization of the WFPC2 Documents on the Website
-Inge Heyer
The documents section on the WFPC2 website has been
re-organized to make documents easier to find. The documents
have been grouped into Documents (Instrument Handbook,
manuals, etc.) and General Resources (reference file lists,
memos, etc.). Each section has an overview, and in addition,
we have created a one-page sheet to list the primary
references needed for proposal preparation and data
reduction. Community feedback on this re-organization is
welcomed.
+----------------------------------------------------------+
| Recent WFPC2-related Papers/Preprints
+----------------------------------------------------------+
We draw your attention to these papers, based on WF/PC and
WFPC2 data, that have appeared since the last STAN, or will
appear in the next few months. This list includes all
preprints received by the STScI Library not yet published
in the journals. Please remember to include our Library in
your preprint distribution list.
AFANASIEV, V.; SIL'CHENKO, O.K. "Complex Formation History
of the Lenticular Galaxies with Stellar Counterrotation:
NGC 4128 and NGC 4550" AJ 124: 706-721, 2002
AGUERRI, J.A.L.; TRUJILLO, I. "Restrictions to the Galaxy
Evolutionary Models from the Hawaiian Deep Fields SSA13 and
SSA22" MNRAS 333: 633-651, 2002
ALVES, D.R.; REJKUBA, M.; MINNITI, D.; COOK, K.H. "K-band
Red Clump Distance to the Large Magellanic Cloud" ApJ 573:
L51-L54, 2002
BALOGH, M.L.; COUCH, W.J.; SMAIL, I.; BOWER, R.G.; GLAZEBROOK,
K. "An H alpha Survey of the Rich Cluster A 1689" MNRAS 335:
10-22, 2002
BENNERT, N.; FALCKE, H.; SCHULZ, H.; WILSON, A.S.; WILLS,
B.J. "Size and Structure of the Narrow-Line Region of Quasars"
ApJ 574: L105-L109, 2002
BENSON, A.J.; ELLIS, R.S.; MENANTEAU, F. "On the Continuous
Formation of Field Spheroidal Galaxies in Hierarchical Models
of Structure Formation" MNRAS 336: 564-576, 2002
BESWICK, R.J.; PEDLAR, A.; MCDONALD, A.R. "Sub-arcsecond
Atomic Hydrogen Absorption in the Seyfert Galaxies NGC 7674
and NGC 7469" MNRAS 335: 1091-1099, 2002
BROTHERTON, M.S.; GRABELSKY, M.; CANALIZO, G.; VAN BREUGEL,
W.; FILIPPENKO, A.V.; CROOM, S.; BOYLE, B.; SHANKS, T. "Hubble
Space Telescope Imaging of the Poststarburst Quasar UNJ1025-0040:
Evidence for Recent Star Formation" PASP 114: 593-601, 2002
BUJARRABAL, V.; ALCOLEA, J.; SANCHEZ CONTRERAS, C.; SAHAI, R.
"HST Observations of the Protoplanetary Nebula OH 231.8+4.2:
the Structure of the Jets and Shocks" A&A 389: 271-285, 2002
CHATTERJEE, S.; CORDES, J.M. "Bow Shocks from Neutron Stars:
Scaling Laws and Hubble Space Telescope Observations of the
Guitar Nebula" ApJ 575: 407-418, 2002
CORBIN, M.R.; O'NEIL, E.; RIEKE, M.J. "Hubble Space Telescope
NICMOS Imaging of the Core of M87" AJ 124: 183-190, 2002
COURBIN, F.; MEYLAN, G.; KNEIB, J.-P.; LIDMAN, C. "Cosmic
Alignment Towards the Radio Einstein Ring PKS 1830-211?"
ApJ 575: 95-102, 2002
CROCKER, M.M.; DAVIS, R.J.; SPENCER, R.E.; EYRES, S.P.S.;
BODE, M.F.; SKOPAL, A. "The Symbiotic Star CH Cygni --
III. A Precessing Radio Jet" MNRAS 335: 1100-1108, 2002
CUZZI, J.N.; FRENCH, R.G.; DONES, L. "HST Multicolor (255-1042
nm) Photometry of Saturn's Main Rings. I: Radial Profiles,
Phase and Opening Angle Variations, and Regional Spectra"
Icarus 158: 199-223, 2002
DA COSTA, G.S.; ARMANDROFF, T.E.; CALDWELL, N. "The Dwarf
Spheroidal Companions to M31: WFPC2 Observations of Andromeda
III" AJ 124: 332-348, 2002
DOI, T.; O'DELL, C.R.; HARTIGAN, P. "Internal Velocities in
the Orion Nebula: Large Proper-Motion Features" AJ 124:
445-463, 2002
DROZDOVSKY, I.O.; SCHULTE-LADBECK, R.E.; HOPP, U.; GREGGIO,
L.; CRONE, M.M. "The Dwarf Irregular/Wolf-Rayet Galaxy NGC
4214. I. A New Distance, Stellar Content, and Global
Parameters" AJ 124: 811-827, 2002
ERWIN, P.; SPARKE, L.S. "Double Bars, Inner Disks, and Nuclear
Rings in Early-Type Disk Galaxies" AJ 124: 65-77, 2002
EYRES, S.P.S.; BODE, M.F.; SKOPAL, A.; CROCKER, M.M.; DAVIS,
R.J.; TAYLOR, A.R.; TEODORANI, M.; ERRICO, L.; VITTONE, A.A.;
ELKIN, V.G. "The Symbiotic Star CH Cygni -- II. The Ejecta
from the 1998-2000 Active Phase" MNRAS 335: 526-538, 2002
FARRAH, D.; MEIKLE, W.P.S.; CLEMENTS, D.; ROWAN-ROBINSON, M.;
MATTILA, S. "The Host Galaxies of Type Ia Supernovae at z =
0.6" MNRAS 336: L17-L21, 2002
GIRARDI, L.; BERTELLI, G.; BRESSAN, A.; CHIOSI, C.; GROENEWEGEN,
M.A.T.; MARIGO, P.; SALASNICH, B.; WEISS, A. "Theoretical
Isochrones in Several Photometric Systems.
I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington,
and ESO Imaging Survey Filter Sets" A&A 391: 195-212, 2002
GOAD, M.R.; ROBERTS, T.P.; KNIGGE, C.; LIRA, P. "The Optical
Counterpart of the Ultraluminous X-ray Source NGC 5204 X-1"
MNRAS 335: L67-L70, 2002
GONZALEZ DELGADO, R.M.; ARRIBAS, S.; PEREZ, E.; HECKMAN, T.
"Is a Minor Merger Driving the Nuclear Activity in the Seyfert
2 Galaxy NGC 2110?" ApJ 579: 188-204, 2002
HALL, P.B.; RICHARDS, G.T.; YORK, D.G.; KEETON, C.R.; BOWEN,
D.V.; SCHNEIDER, D.P.; SCHLEGEL, D.J.; BRINKMANN, J. "The
Redshift of a Lensing Galaxy in PMN J0134-0931" ApJ 575:
L51-L54, 2002
HAMILTON, T.S.; CASERTANO, S.; TURNSHEK, D.A. "The Luminosity
Function of QSO Host Galaxies" ApJ 576: 61-74, 2002
HANSEN, B.M.S.; BREWER, J.; FAHLMAN, G.G.; GIBSON, B.K.;
IBATA, R.; LIMONGI, M.; RICH, R.M.; RICHER, H.B.; SHARA, M.M.;
STETSON, P.B. "The White Dwarf Cooling Sequence of the
Globular Cluster Messier 4" ApJ 574: L155-L158, 2002
HARRIS, W.E.; HARRIS, G.L.H.; HOLLAND, S.T.; MCLAUGHLIN,
D.E. "Structural Parameters for Globular Clusters in NGC 5128"
AJ 124: 1435-1451, 2002
HESTER, J.J.; MORI, K.; BURROWS, D.; GALLAGHER, J.S.; GRAHAM,
J.R.; HALVERSON, M.; KADER, A.; MICHEL, F.C.; SCOWEN, P.
"Hubble Space Telescope and Chandra Monitoring of the Crab
Synchrotron Nebula" ApJ 577: L49-L52, 2002
HOEKSTRA, H.; FRANX, M.; KUIJKEN, K.; VAN DOKKUM, P.G. "HST
Large-Field Weak Lensing Analysis of MS 2053-04: Study of the
Mass Distribution and Mass-to-Light Ratio of X-ray Luminous
Clusters at 0.22 < z < 0.83" MNRAS 333: 911-922, 2002
HOMEIER, N.; GALLAGHER, J.S. III; PASQUALI, A. "The Star Cluster
System of the NGC 7673 Starburst" A&A 391: 857-873, 2002
HUGGINS, P.J.; MAURON, N. "Small Scale Structure in
Circumstellar Envelopes and the Origin of Globules in
Planetary Nebulae" A&A 393: 273-283, 2002
JORDAN, A.; COTE, P.; WEST, M.J.; MARZKE, R.O. "The Relative
Ages of the Globular Cluster Subpopulations in M87" ApJ 576:
L113-L116, 2002
KARACHENTSEV, I.D.; SHARINA, M.E.; MAKAROV, D.I.; DOLPHIN,
A.E.; GREBEL, E.K.; GEISLER, D.; GUHATHAKURTA, P.; HODGE, P.W.;
KARACHENTSEVA, V.E.; SARAJEDINI, A.; SEITZER, P.
"The Very Local Hubble Flow" A&A 389: 812-824, 2002
KERBER, L.O.; SANTIAGO, B.X.; CASTRO, R.; VALLS-GABAUD, D.
"Analysis of Colour-Magnitude Diagrams of Rich LMC Clusters:
NGC 1831" A&A 390: 121-132, 2002
KUIJKEN, K.; RICH, R.M. "Hubble Space Telescope WFPC2 Proper
Motions in Two Bulge Fields: Kinematics and Stellar
Population of the Galactic Bulge" AJ 124: 2054-2066, 2002
KUNDU, A.; MACCARONE, T.J.; ZEPF, S.E. "The Low-Mass X-ray
Binary-Globular Cluster Connection in NGC 4472" ApJ 574:
L5-L9, 2002
LARSEN, S.S. "The Luminosity Function of Star Clusters in
Spiral Galaxies" AJ 124: 1393-1409, 2002
LARSEN, S.S.; BRODIE, J.P.; SARAJEDINI, A.; HUCHRA, J.P.
"Structural Parameters and Dynamical Masses for Globular
Clusters in M33" AJ 124: 2615-2624, 2002
LAUER, T.R.; GEBHARDT, K.; RICHSTONE, D.; TREMAINE, S.;
BENDER, R.; BOWER, G.; DRESSLER, A.; FABER, S.M.; FILIPPENKO,
A.V.; GREEN, R.; GRILLMAIR, C.J.; HO, L.C.; KORMENDY, J.;
MAGORRIAN, J.; PINKNEY, J.; LAINE, S.; POSTMAN, M.; VAN DER
MAREL, R.P. "Galaxies with a Central Minimum in Stellar
Luminosity Density" AJ 124: 1975-1987, 2002
LI CAUSI, G.; DE MARCHI, G.; PARESCE, F. "On the Accuracy of
the Signal-to-Noise Estimates Obtained with the Exposure-Time
Calculator of the Wide Field Planetary Camera 2 on Board the
Hubble Space Telescope" PASP 114: 770-779, 2002
LIRA, P.; WARD, M.J.; ZEZAS, A.; MURRAY, S.S. "Chandra HRC
and HST Observations of NGC 6240: Resolving the Active Galactic
Nucleus and Starburst" MNRAS 333: 709-714, 2002
LUBIN, L.M.; OKE, J.B.; POSTMAN, M. "Evidence for Cluster
Evolution from an Improved Measurement of the Velocity
Dispersion and Morphological Fraction of Cluster 1324+3011
at z = 0.76" AJ 124: 1905-1917, 2002
MENDEZ, B.; DAVIS, M.; MOUSTAKAS, J.; NEWMAN, J.; MADORE,
B.F.; FREEDMAN, W.L. "Deviations from the Local Hubble Flow.
I. The Tip of the Red Giant Branch as a Distance Indicator"
AJ 124: 213-233, 2002
MOFFAT, A.F.J.; CORCORAN, M.F.; STEVENS, I.R.; SKALKOWSKI,
G.; MARCHENKO, S.V.; MUCKE, A.; PTAK, A.; KORIBALSKI, B.S.;
BRENNEMAN, L.; MUSHOTZKY, R.; PITTARD, J.M.; POLLOCK, A.M.T.;
BRANDNER, W. "Galactic Starburst NGC 3603 from X-rays to
Radio" ApJ 573: 191-198, 2002
NELSON, C.A.; COOK, K.H.; AXELROD, T.S.; MOULD, J.R.; ALCOCK,
C. "A Proper-Motion Survey for White Dwarfs with the Wide
Field Planetary Camera 2" ApJ 573: 644-661, 2002
PALMA, C.; ZONAK, S.G.; HUNSBERGER, S.D.; CHARLTON, J.C.;
GALLAGHER, S.C.; DURRELL, P.R.; ENGLISH, J. "The Beginning
of the End: Hubble Space Telescope Images of Seyfert's Sextet"
AJ 124: 2425-2439, 2002
PAPADEROS, P.; IZOTOV, Y.I.; THUAN, T.X.; NOESKE, K.G.;
FRICKE, K.J.; GUSEVA, N.G.; GREEN, R.F. "The Blue Compact
Dwarf Galaxy I Zw 18: a Comparative Study of Its
Low-Surface-Brightness Component" A&A 393: 461-483, 2002
PASQUALI, A.; NOTA, A.; SMITH, L.J.; AKIYAMA, S.; MESSINEO,
M.; CLAMPIN, M. "Multiwavength Study of the Nebula Associated
with the Galactic LBV Candidate HD 168625" AJ 124: 1625-1635,
2002
PENG, C.Y. "Assessing Formation Scenarios for the Double
Nucleus of M31 Using Two-Dimensional Image Decomposition"
AJ 124: 294-309, 2002
PERLMAN, E.S.; STOCKE, J.T.; CARILLI, C.L.; SUGIHO, M.;
TASHIRO, M.; MADEJSKI, G.; WANG, Q.D.; CONWAY, J. "The
Apparent Host Galaxy of PKS 1413+135: Hubble Space Telescope,
ASCA and Very Long Baseline Array Observations"
AJ 124: 2401-2412, 2002
PIOTTO, G.; KING, I.R.; DJORGOVSKI, S.G.; SOSIN, C.; ZOCCALI,
M.; SAVIANE, I.; DE ANGELI, F.; RIELLO, M.; RECIO BLANCO, A.;
RICH, R.M.; MEYLAN, G.; RENZINI, A. "HST Color-Magnitude
Diagrams of 74 Galactic Globular Clusters in the HST F439W
and F555W Bands" A&A 391: 945-965, 2002
PIZZELLA, A.; CORSINI, E.M.; MORELLI, L.; SARZI, M.; SCARLATA,
C.; STIAVELLI, M.; BERTOLA, F. "Nuclear Stellar Disks in Spiral
Galaxies" ApJ 573: 131-137, 2002
POULET, F.; CUZZI, J.N.; FRENCH, R.G.; DONES, L. "A Study of
Saturn's Ring Phase Curves from HST Observations" Icarus 158:
224-248, 2002
PRITZL, B.J.; ARMANDROFF, T.E.; JACOBY, G.H.; DA COSTA, G.S.
"The Dwarf Spheroidal Companions to M31: Variable Stars in
Andromeda VI" AJ 124: 1464-1485, 2002
PUZIA, T.H.; ZEPF, S.E.; KISSLER-PATIG, M.; HILKER, M.;
MINNITI, D.; GOUDFROOIJ, P. "Extragalactic Globular Clusters
in the Near-Infrared. II. The Globular Clusters Systems of
NGC 3115 and NGC 4365" A&A 391: 453-470, 2002
RAGES, K.; HAMMEL, H.B.; LOCKWOOD, G.W. "A Prominent
Apparition of Neptune's South Polar Feature" Icarus 159:
262-265, 2002
RICHER, H.B.; BREWER, J.; FAHLMAN, G.G.; GIBSON, B.K.; HANSEN,
B.M.; IBATA, R.; KALIRAI, J.S.; LIMONGI, M.; RICH, R.M.;
SAVIANE, I.; SHARA, M.M.; STETSON, P.B. "The Lower Main
Sequence and Mass Function of the Globular Cluster Messier 4"
ApJ 574: L151-L154, 2002
RUBIN, R.H.; BHATT, N.J.; DUFOUR, R.J.; BUCKALEW, B.A.;
BARLOW, M.J.; LIU, X.-W.; STOREY, P.J.; BALICK, B.; FERLAND,
G.J.; HARRINGTON, J.P.; MARTIN, P.G. "Temperature Variations
from Hubble Space Telescope Imagery and Spectroscopy of NGC
7009" MNRAS 334: 777-786, 2002
SAHA, A.; CLAVER, J.; HOESSEL, J.G. "Cepheids and Long-Period
Variables in IC 342" AJ 124: 839-861, 2002
SAHAI, R.; BRILLANT, S.; LIVIO, M.; GREBEL, E.K.; BRANDNER,
W.; TINGAY, S.J.; NYMAN, L.-A. "Proper Motions in the Knotty,
Bipolar Jet in Henize 2-90" ApJ 573: L123-L127, 2002
SANCHEZ CONTRERAS, C.; SAHAI, R.; GIL DE PAZ, A. "Physical
Structure of the Proto-planetary Nebula CRL 618. I. Optical
Long-Slit Spectroscopy and Imaging" ApJ 578: 269-289, 2002
SANCHEZ-LAVEGA, A. "Observations of Saturn's Ribbon Wave 14
Years after Its Discovery" Icarus 158: 272-275, 2002
SAND, D.J.; TREU, T.; ELLIS, R.S. "The Dark Matter Density
Profile of the Lensing Cluster MS 2137-23: a Test of the
Cold Dark Matter Paradigm" ApJ 574: L129-L133, 2002
SANTIAGO, B.; KERBER, L.; CASTRO, R.; DE GRIJS, R. "On the
Nature of a Secondary Main-Sequence Turn-Off in the Rich LMC
Cluster NGC 1868" MNRAS 336: 139-150, 2002
SCHINNERER, E.; MACIEJEWSKI, W.; SCOVILLE, N.; MOUSTAKAS,
L.A. "Toward the Secondary Bar: Gas Morphology and Dynamics
in NGC 4303" ApJ 575: 826-844, 2002
SCHMIDT, G.D.; HINES, D.C.; SWITH, S. "The Nascent Bipolar
Nebula Surrounding the Carbon-rich Variable CIT 6: Transition
to Axisymmetry" ApJ 576: 429-444, 2002
SCHMITT, H.R.; PRINGLE, J.E.; CLARKE, C.J.; KINNEY, A.L.
"The Orientation of Jets Relative to Dust Disks in Radio
Galaxies" ApJ 575: 150-155, 2002
SCHULTE-LADBECK, R.E.; HOPP, U.; DROZDOVSKY, I.O.; GREGGIO,
L.; CRONE, M.M. "The Oldest Stars of the Extremely Metal-Poor
Local Group Dwarf Irregular Galaxy Leo A" AJ 124: 896-914, 2002
SIMARD, L.; WILLMER, C.N.A.; VOGT, N.P.; SARAJEDINI, V.L.;
PHILLIPS, A.C.; WEINER, B.J.; KOO, D.C.; IM, M.; ILLINGWORTH,
G.D.; FABER, S.M. "The DEEP Groth Strip Survey. II. Hubble
Space Telescope Structural Parameters of Galaxies in the
Groth Strip" ApJS 142: 1-33, 2002
SIMON-MILLER, A.A.; GIERASCH, P.J.; BEEBE, R.F.; CONRATH,
B.; FLASAR, F.M.; ACHTERBERG, R.K.; CASSINI CIRS TEAM "New
Observational Results Concerning Jupiter's Great Red Spot"
Icarus 158: 249-266, 2002
SIRIANNI, M.; NOTA, A.; DE MARCHI, G.; LEITHERER, C.;
CLAMPIN, M. "The Low End of the Initial Mass Function in
Young Clusters. II. Evidence for Primordial Mass Segregation
in NGC 330 in the Small Magellanic Cloud" ApJ 579: 275-288,
2002
SMITH, G.P.; SMAIL, I.; KNEIB, J.-P.; DAVIS, C.J.; TAKAMIYA,
M.; EBELING, H.; CZOSKE, O. "A Hubble Space Telescope Lensing
Survey of X-ray Luminous Galaxy Clusters -- III. A Multiply
Imaged Extremely Red Galaxy at z=1.6" MNRAS 333: L16-L20, 2002
SROMOVSKY, L.A.; FRY, P.M. "Jupiter's Cloud Structure as
Constrained by Galileo Probe and HST Observations"
Icarus 157: 373-400, 2002
STOCKTON, A.; MACKENTY, J.W.; HU, E.M.; KIM, T.-S. "The
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